PTD

PTD may refer to:

Law

• Permanent total disability, in insurance law
• Pre-trial diversion, in criminal justice
• Protected trust deed, in Scottish bankruptcy law

Science, technology and mathematics

• Pathfinder Technology Demonstrator, ongoing NASA missions to test miniaturized satellites
• Peak–trough difference, of an oscillating curve
• Poloidal–toroidal decomposition, in vector calculus
• Pre-term delivery, a human birth under 37 weeks gestation
• PTD-DBM, a synthetic peptide to reverse hair loss
• Pre-Thread Data file, in Microsoft's .NET Framework

Other uses

• Participatory technology development, in international agriculture programs
• Partido de los Trabajadores Dominicanos or the Dominican Workers' Party
• Potsdam Municipal Airport, New York, US (FAA LID:PTD)
• Post travel depression, a mood disorder
• Prevention through design, in occupational health and safety